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How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and mind-blowing filter technology to create the coffee we love. How exactly does it work?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee, however the main difference lies in the pressure.

The Group Head

The name implies, the group head is where you place your portafilter when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the resulting extraction. There are many different types of group heads each with distinct advantages and drawbacks. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, like the E61. This is a favorite among baristas since it provides multiple advantages in one package.

As you can see in the above photo, the group head has several notches where you place your portafilter and then twist it manually to lock it in. A gasket of rubber is situated within the notches to make a seal when you insert your portafilter. The notches permit precise placement of the portafilter. This is essential for an efficient extraction.

Apart from allowing you easily insert your portafilter, the group head is responsible to maintain an even temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is constant to extract the coffee. It is important to realize that even a tiny variation can mean the difference between a decent and a great espresso.

The Pump

In contrast to piston machines that are manually operated, that use a lever to pressurize water, the rotary espresso machines use motorized pumps to deliver the nine atmospheric bars of pressure that are required to extract espresso. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.

Pumps are generally more affordable and last longer than piston-driven machines. However, both types of machines can degrade because of excessive use and inadequate cleaning. They also add mechanical complexity that can lead to the cost of even the most basic models.

Some espresso machines can eliminate the pump completely and make use of steam pressure to make espresso. This can result in over-extraction because the boiler that produces steam also heats the water until it comes to a boil. The machines must also constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines utilize either a rotary or vibration pump, with a vibrating model using a rotating disc that generates the pressure and the rotary model pushing hot water through the grounds at high speed. Both types of machines can make excellent espresso, but Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats the water to the optimal temperature for extraction. The resulting steam is then transferred to the portafilter, which contains the ground espresso coffee and is then funneled down into the cup. During this process, steam creates pressure to push through the grounds of the coffee espresso machine. This results in a whipped-up the top of the espresso. This is one of the main characteristics of a good retro espresso machine.

There are three kinds of espresso makers, and they differ in the kind of pump they use and the degree of heat that the espresso is. There are a variety of ways to control the brew and the size of cup that can be made by the machine.

The first espresso machines were steam type. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burnt. The modern espresso machine was developed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines home machines, they think of these machines. If you have a semi-automatic machine you need to grind the beans and tamp them yourself but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and mechanized consistency.

The Filter

Typically, espresso machines employ filters that separate the grounds of coffee as they move through the hot water. The filter is also a crucial component of the temperature control system, as it prevents the machine from overheating.

It also helps with flavor as a filter allows for a more prolonged bloom time. This lets the beans release their flavors, and also allows for better extraction.

It is important to remember that even the most efficient filter can make a bad cup of coffee. The quality espresso machine of the beans and the extraction process are still very important.

This is where the magic happens. It's what makes espresso taste good. The grouphead, also referred to as the brew head, is where the portafilter (the container you place the coffee grounds into) is placed when making espresso.

Steam-driven espresso machines make use of hot water that is heated inside an airtight container to produce steam. The steam then moves hot water through the grounds of the coffee under pressure. These kinds of machines tend to be less expensive and simpler to maintain than pumps-driven models. However, they are limited in their ability to provide the perfect conditions for brewing, Espressomachines (Enfogentraining.Com) since they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bars.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They utilize an air compressor to force hot water through the ground and are more mobile than steam-driven electric espresso machines.